Bracket



ApriH 10, 195l F. G. HoRsTMANN 2,548,476

BRACKET Filed Oct. 15, 1947 2 Sheets-Sheet 1 April 10, 1951 F. G. HoRsTMANN 2,548,476

BRACKET Filed oct. 15, 1947 2 `shwsheet z Patented Apr. 10, 1951 BRACKET Frederick G. Horstmann, Guildford,l England; Kathleen Mary ,Elizabeth Quicke Horstmann and Harold Herbert Norris executors of said Frederick George Quicke Horstmann, deceased Application October 15, 1947, Serial No. 780,000 In Great Britain November 17, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires November 17,1964

Claims.

This invention relates to an improved mounting, more particularly for inspection .lampsand has for its chief object to provide an improved and simple mounting which will enable the lamp to be quickly and easily arranged to throw the light on any desired point within its range and to stay put in any given position, and which will, furthermore, at all times, be balanced and stable.

According to the present invention, the lamp or other article is carried at one end of a rst parallel linkage system, the other end of which 1s connected to a second parallel linkage system which, in turn, is connected at its further end to a base or support and the whole is balanced by means of a weight carried by one link (or by an extension of one link) of a third parallel linkage system, the inclination of one pair of links of the said third parallel linkage system being controlled by movement of the rst par-allel linkage system, and the inclination of the other pair of links of the third parallel linkage system being controlled by movement of the second parallel linkage system.

Conveniently all three of the parallel linkage systems have a common pivot point, adjacent links of the third parallel linkage system at this point being formed one by an extension of one of the links of the rst parallel linkage system, and the other partly of that link of the second parallel linkage system which extends down to the base or support and partly by an extension of the same beyond the pivot.

Preferably the parts are so proportioned that an imaginary line adjoining the centre of gravity of the lamp or other article and the centre of gravity of the counter-weight will at all times pass through the point at which the link common to the second and third parallel linkage systems is pivoted to the base or support.

In order that this invention may be the more clearly understood and readily carried into effect, I will proceed to describe the same with l reference to the accompanying drawings, which illustrate by way of example one convenient embodiment of the present invention, and in which:

Figures l and 2 are somewhat diagrammatic views showing the relationship of the various parallell'linkage systems andthe way in which they co-operate with one another.

Figure 3 is a perspective view of an-inspection lamp mounting according to thev present invention, and y Figures 4 and 5 are respectively cross-section through and end elevationof a detail of construction more fully described hereinafter.

, 2 Referring now to the drawings, the'inspection .lamp mounting therein illustrated comprises a support Ill which may, if desired, be pivotally mounted as at II so that it can rotate on a vertical axis ona base I2, said support ID extending Y upwardly and having an upwardly and rearwardly inclined portion Ia. Pivotally mounted at spaced points on this inclined portion of the support are the members I3, I4 Yof the second parallel linkage system kabove-mentioned. The upper ends of these links I3, I4 are pivoted at I3a, Illa to a triangular member I5 having a front face to which are pivotally connected at spaced points I3a, Ilia, the forwardly extending links I6, I'I of the rstmentioned parallel linkage system. Both parallel linkage systems are preferably duplicated and the lamp 20 may be mounted between the front ends of the nrst parallel linkage system in the manner described in my prior British Patent No. 559,006, so that the advantages of theY mounting described in that specification are obtained. Any other method of mounting the lamp, with or without friction-tight holding means may, of course, be employed without departing from the scope of the present invention.

Y Now it will be appreciated that with such an arrangement of two parallel linkage systems I3,

Y I4 and I6, I'I, the lamp 20 may be moved to any desired position within the range of the two parallel linkage systems, but the problem is to counter-balance lthe weight of the lamp at the Widely different distances from the support I 0 at which it can be disposed. This difculty is overcome, according to the present invention, by the aid of a single counter-balance weight-and a third parallel linkage system.

The rear end of the lower link I1 of the first parallel linkage system` I6, II and the upper end of the front link I3 of the second parallel linkage system I3, I4 are arranged to have a common pivot point I3a on the triangular member I5,`and the third parallellinkage system is established as follows: the top link I'Ia by an extension of the bottom link I'I of the rst parallel linkage system I6, I1 beyond the pivot point I3a, the front link, in part, by the front link I3 of the second parallel'linkage system I3, I4 and, in part, by an extension I 3b of the same beyond the point 2l at which it is pivoted to the support I0, andthe Vback and bottom links by links 22, 23 corresponding respectively to the front and top links I'Ia` and I.3, I3b, but forming no part vof the other parallel linkagesystems. The bottom link 22 is extended rearvs/ardlxr, as at 22a, "andffat the appropriate point is provided with a counter-balance 24 of the required weight.

With such an arrangement inclination of the top and bottom links I'Ia andf22, 22a, of the third parallel 'linkage system will be controlled by movement of the rst parallel linkage system I6, II, and the inclination of the front and backlinks I3, I3b and 23, will be controlled by movement of the second parallel linkage ,system I3,. I 4 and the position of the counter-weight 124 and,.more particularly, the distance from .the front lower pivot 2| of the second parallel linkage `system at which it lies will depend upon the position of the lamp. This will be appreciatedrnore ,-clearlyon reference to Figures l and 2, the two positions'of Figure 1 showing the yWay in'tvhich .the rst parallel linkage system I6, ll controls tlieposition of the links I'Ia, 22, 22a, whilst Figure2 shows how the inclination of .the front and back links I3, I3b and 23 is controlled by movement of the 'second parallel `linkage system I3, I`4. The `counter-balancing moment, due to the counterbalance Weightl 211, will be small when thelamp is arranged that the weight of the lamp is-exactly counter-*balanced in all :positions without the -aid of friction washers at lthe joint, or at least with only very little vfriction at'the joints. The

Ilarnp may thus be freely moved With the least .energy to any desired position, will stay putin A'that 'position and, furthermore, will be quite :stable in thatpositiom there being no tendency `:topoverbalance however far the lamp be stretched out away; from the basev or. support.

It will be found that with'the parts so :pro-

gportioned and arranged a complete counter- -balance is obtainediat vall times, an imaginary line Y (the chain lines A in Figures 'l and 2) joining the lcentre of gravity of the lamp with the centre of gravity of the counter-balance Weight will pass through the front pivot of the second parallel 4linkage tothe base so that the mounting becomes `in effect a simple counter-balanced lever ojf ythe .rst order Whilst, atthe same time, `permitting the lamp to `be positioned at any point `Within the combined range of the niirst and zsecond 4parallel linkage systems.

With ,the construction above described 4fa certain amount of whip Vmay develop the -mounting lparticularly if the first and secondmentioned vparallel linkage systems .are long. `In 1orderto overcome this, one :of Vthe links .maybe .made-,of ,flattened tubular form,, assho'wn Vat lb l,in-V the Vdetail views of Figures 4 and;5andmay bearranged closely to surround the opposite link l'I of the parallel linkage systemin questionfexcept at its ends (see Figure 5). This lwill overcome any whip in the mounting Vas will be appreciated.

Although the l present `,invention vhas `been .de-

lscribed moreparticularly as a mountingfor in- .spectionlamps ,it Will loe-appreciated thatitis f-lgually `applica-ble tothe mounting of ,other .',articlessuoh as'shaving and other mirrors.

Iclaim:

1. A mounting for supporting an inspection lamp, which comprises, in combination: *a supporting base a rstparallel linkage '-system, Ysaid parallel linkage system being adapted, at one end thereof, to support said inspection lamp; a second parallel linkage system connected at one end ythereof to the .end of said iirst parallel linkage system which is remote from said end thereof at which said inspection lamp is supported, and

'the other end of said second parallel linkage system being connected to said supporting base; a third parallel linkage system connected at one ,end .to said first and second parallel linkage V-systems, said third parallel linkage system comjprisingftwo 'pairs of links, one pair thereof being connected at one end of said first pair of links to .said/rstjparallel linkage system, and the second pair thereof being connected at one end of said :second pairoflinks to said second parallel linkage fsystemanda counterbalancing IWeight carried by said third parallel linkage system at the ends of the said pairs of links thereof remote from the ends to which said first and second parallel vlinkage systems are connected,'the inclination of one pair oi links of said third parallel linkage system being thus controlled by movement of said rst parallel linkage system, and the inclination oi the other .pair of links of said thirdparallel linkage system being thus controlled by movement of said second parallel linkage system` 2. A mounting for supporting an inspection lamp as dened in claim l, which includes a triangularly-shaped member forming one end link of both said rst and second parallel linkage systems, said rst parallel linkage system and said second parallel linkage system being vboth connected to said triangularly-shaped member,

v said connectionbetween one end of said.rst parallel linkage system andone end `of saidsecond parallel linkage system, thusbeingfaccomplished by said 'connections of both to isaid Ltriangularly-shaped member, and .said two parallel linkage systems which are thus connected having one pivot point in common, said pivot `.point in common being positioned adjacent .one corner of said triangularly-shaped member. '3. A vmounting for supporting .an vinspectie `lamp'as deiined in claim 11, wherein allthreeof said parallel linkage systems have a pivot point in common, wherein the links ofi one of the pairs of links of said rst parallel linkage ksystem are provided with extensions at one end thereof, and wherein-the links of one of the pairs of links of said second parallel linkage system are provided with extensions at one end thereof beyond that point vatwhich said links are connected to said vsupporting base, the pairs of links of adjacent V'links of said third parallel linkage system being formed, as to one pair, by'said extensions Jon said links of said first parallel linkage system and as to said second pair partly by said links of said second Yparallel linkage system which are 'connected'to said supporting base, and partly bysaid Vextensions thereof beyond said supportngbase.

4. A mounting 1 for supporting an inspection lamp as dened in claim 3, wherein said parallel linkage systems and said counterbalancing Weight are so arranged and proportioned that an imaginaryline joining the center of gravity of the inspection lamp supported by said /iirst parallel linkage system and the center of gravity of said counterbalancing Weight passes through Athe point' at which said link which is common to said vsecond and said third parallel linkage systems is connected to said supporting base, for

Hall positions of said parallel linkage systems and said supportedinspection lamp.

5. A mounting `'for supporting an inspection lamp as dened in claim 4, wherein one long link of at least one of said parallel linkage systems is formed throughout the major portion oi?v its extent in flattened tubular shape, and wherein said link of flattened tubular shape closely surrounds the opposite long link which, together with said link of flattened tubular shape, comprises a pair of parallel links.

F. G. HORSTMANN.

REFERENCES CITED The following references are of record in the le of this patent:

Number w Number ,6 UNITED STATES PATENT Name Date Alling et al.' Aug. 5, 1879 Bausch et al May 7, 1929 Pieper Mar. 31, 1936 Erickson May 4, 1936 Carwardine Apr. 6, 1937 FOREIGN PATENTS Country p Date Great Britain May 9, 1929 Holland Apr. 16, 1938 

